Having trouble with inaccurate measurements of fluid quantity in your production process? Choosing a Coriolis Flow Sensor allows direct measurement of mass flow rate in the production process. The engineering team at SCMA is ready to provide consulting services and design mass flow measurement systems that meet industrial needs. This article will take you through the working principles, types of sensors, and even a checklist for purchasing to help improve production efficiency.
What is a Coriolis Flow Sensor?
Coriolis Flow Sensor is a high-accuracy instrument for measuring mass flow rate of liquids and gases. This device operates based on a physical principle known as Coriolis Effect. The device reports the mass flow rate, and many models provide density and temperature of the process in a single unit.
How the Coriolis Flow Sensor Works
The operation of this type of sensor relies on a physical phenomenon to detect changes in the vibration of the tube when the fluid flows through. The working process of mass flow meter can be divided into the following important steps
Tube Oscillation
The driver causes the measuring tube to vibrate at the resonance frequency of the tube and fluid system. The sensor receives the vibration signal from the tube for processing
Coriolis Effect
When the fluid flows through the vibrating tube, the Coriolis force causes the tube to twist slightly. This twist changes the vibration rhythm detected by the sensor
Signal Detection
Two sensors installed at the inlet and outlet of the tube are responsible for detecting movement. In the case of no flow, the tube vibrates simultaneously in sync, but when fluid flows through, signals from both sensors will create a phase shift (Phase Shift)
Flow Calculation
Within the defined operating range the time difference between the vibration signals is related to the mass flow rate The device uses calibrated values to convert the signal into a flow value and uses the resonance frequency to determine the density
How many types of Coriolis Flow Sensors are there?
Based on SCMA's experience in designing solutions, selecting the pipe shape of the sensor to suit the type of fluid is very important. Coriolis flow meters are divided into 2 main types based on the internal pipe structure.
Curved Tube / U-Tube Sensor
The curved tube is a common structure. Performance depends on the shape, size of the tube, and flow conditions. You should check the accuracy, pressure drop, and fluid discharge from the product specifications.
Straight Tube Sensor
The straight tube is another option when pressure drop, fluid discharge, or cleaning requirements are important. Check the product data and fluid properties because the tube shape alone does not indicate the performance.
Maintenance of Coriolis Flow Sensor
Although the measuring tube vibrates during operation, this type of instrument has no impeller or rotating parts that come into contact with the fluid. Inspection and maintenance according to the manual are still necessary when there is contamination, corrosion, or wear.
Inspection and Cleaning
Check for leaks and the condition of the joints according to the maintenance schedule. Before opening the system or cleaning, separate and depressurize according to the on-site procedures. Choose the cleaning method specified by the manufacturer and compatible with the material and fluid.
Calibration
Determine the calibration or verification cycle according to the work requirements and the history of measurement results. If zero adjustment is required, use the conditions specified in the manual, such as full pipe, stationary fluid, and stable process conditions. Zero adjustment is a different procedure from calibration of the measurement range.
Precautions for Use
The equipment should be installed away from points where the vibration exceeds the device's specifications. The system operator must prevent large solids from blocking the pipe and control the temperature and pressure to stay within safe limits.
Application of Coriolis Flow Sensor in Industry
This sensor directly measures mass flow rate, suitable for applications requiring tracking of the mass of fluid passing through the pipe. It should be checked for the effects of pressure, temperature, and flow conditions according to the specifications of the equipment for each application.
Chemical and Petrochemical Industry
Chemical plants use mass flow values to control mixing ratios, choose compatible fluid contact materials, and check pressure and temperature ratings.
Food and Beverage Industry
Engineers found that this flow meter is suitable for measuring the quantity of viscous ingredients such as milk, syrup, and alcohol. The easily cleanable pipe structure also meets hygiene standards in food factories.
Oil and Petroleum Industry
Custody transfer operations use mass meters with suitable accuracy according to system criteria. It is necessary to check the certification requirements, installation, and measurement uncertainty for that application.
Pharmaceutical and Medical Device Industry
Pharmaceutical factories may use mass flow values to control the delivery of ingredients. It is necessary to check the suitability of materials, cleaning, and process verification according to product specifications.
Advantages of Coriolis Flow Sensor
Switching to a Coriolis mass flow meter is a valuable long-term investment. This technology has several advantages that help improve production processes to be more efficient than the original system.
Accuracy and Multi-parameter Measurement
The direct mass flow meter provides density information with temperature. Many models calculate volumetric flow rate from mass and density. Accuracy depends on the model, type of fluid, flow range, and conditions specified in the specifications.
Durability and Flexible Operation
The absence of impellers or rotating internal parts in the flow path reduces wear from rotating mechanisms. However, the measuring tube may still be affected by corrosion, erosion, or deposit accumulation. Therefore, it is important to select suitable materials and maintenance plans according to the fluid.
How to Choose a Coriolis Flow Sensor
Considering the purchase of a Coriolis flow meter requires a detailed analysis of on-site factors to avoid errors. The expert team recommends the following checklist for selecting a mass flow meter:
- Fluid Properties: Check viscosity, corrosion, gas bubbles, and multi-phase composition to select materials of components in contact with the fluid and models that support these conditions
- Accuracy Level: Compare the measurement specification with the criteria of the work throughout the actual flow range. For trading purposes, check the certification and relevant requirements as well
- Pipe Size and Flow Rate: Select the size based on the minimum, normal, and maximum flow range, as well as the acceptable pressure drop. Then check the compatibility of the connection
- Display and Signal System (Transmitter & Output): Choose between an on-board display or a remote display, and check the signal ports such as 4-20mA, HART, Modbus to connect with the PLC
- Pressure and Temperature Limits (Pressure & Temperature Limits): The specification of the flow meter must withstand the maximum pressure of the production process for factory safety
Installation Precautions for the Sensor
To ensure the measuring instrument operates at full efficiency, installation must strictly follow engineering standards. Installation precautions that engineers must be aware of include the following important points:
- Avoid vibration-prone areas: Installing near large motors or high-pressure pumps will interfere with the vibration frequency of the sensor pipe, causing the readings to be inaccurate
- Installation Direction: Use the position and direction specified in the model manual to ensure the pipe is full when measuring liquid, reduce gas bubbles or sedimentation according to the nature of the work, and reduce liquid residue when measuring gas
- Supporting the Weight of the Device: This type of equipment is relatively heavy, so a strong weight-supporting structure (Support) must be provided to prevent the flange from bearing excessive load
Summary
Using the Coriolis Flow Sensor is a decision that dramatically enhances the accuracy of mass flow measurement. This device is durable, easy to maintain, and meets the demands of strict production processes. If your factory is looking for an automation solution, the SCMA engineering team is ready to visit the site to design the most suitable measurement system for you.
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Frequently Asked Questions
What types of fluids can the Coriolis Flow Sensor measure?
It can measure both liquids and gases in models designed to accommodate them. For viscous fluids, multiphase fluids, or flows with gas bubbles, check the limitations and specifications of the model before selecting.
Does temperature affect the accuracy of mass measurement?
It can affect temperature and pressure may change the mechanical properties of the measuring tube and affect accuracy. Even though the device directly measures mass flow rate, check the operating range and compensation methods specified by the manufacturer.
How often should the sensor be calibrated?
Determine the interval based on the requirements of the task, operating conditions, calibration history, and manufacturer recommendations. Trading or critical processes may have specific inspection intervals.
Why is this type of device more expensive than general sensors?
Because it uses advanced technology that can measure multiple parameters simultaneously in one unit, uses highly durable materials, and provides the highest accuracy, making it a cost-effective long-term investment.
Can the sensor be installed in vibrating pipes?
Check the vibration coordinates and pipe support guidelines in the manual. If the installation point has significant vibration, assess the location and installation method with the manufacturer before use.
